此为 Mathematica 7 文档,内容基于更早版本的 Wolfram 语言
查看最新文档(版本11.2)

NFourierTransform

NFourierTransform[expr, t, Omega]
gives a numerical approximation to the Fourier transform of expr evaluated at the numerical value Omega, where expr is a function of t.
  • The numerical approximation to the Fourier transform of expr is by default defined to be .
  • Different choices for the definition of the Fourier transform can be specified using the option FourierParameters.
  • With the setting FourierParameters->{a, b}, the Fourier transform computed by NFourierTransform is .
Needs["FourierSeries`"]
Numerical Fourier transform for a box function:
In[2]:=
Click for copyable input
In[3]:=
Click for copyable input
Out[3]=
Compare with the answer from symbolic evaluation:
In[4]:=
Click for copyable input
Out[4]=
In[5]:=
Click for copyable input
Out[5]=
In[6]:=
Click for copyable input
Out[6]=